a bitter, sharply abusive denunciation, attack, or criticism: repeated diatribes against the senator.

1575–85; < Latin diatriba < Greek diatribḗ pastime, study, discourse, derivative of diatríbein to rub away (dia- dia- + tríbein to rub)

tirade, harangue.
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World English Dictionary
diatribe (ˈdaɪəˌtraɪb)
a bitter or violent criticism or attack; denunciation
[C16: from Latin diatriba learned debate, from Greek diatribē discourse, pastime, from diatribein to while away, from dia- + tribein to rub]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1580s, from L. diatriba "learned discussion," from Gk. diatribe "discourse, study," lit. "a wearing away (of time)," from dia- "away" + tribein "to wear, rub," from PIE base *ter- "to rub, turn, twist" (see throw). Sense of "invective" is 1804, apparently from French.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Now, let's calm down and analyze your diatribe.
Your anti-capitalist diatribe is negative and biased.
In the future just read more closely and understand clearly before writing your
This diatribe is so unrelentingly negative that it loses all power to persuade.
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